Your answer is radiometric dating
Congruent segments are segments that have the same lenght
<span>one way is.... many skeletons of dead animals melted together and formed the coral reef. another is ..... volcanic eruption.</span>
<span>If you see a very tall, rock feature that looks like a jagged, rectangular block sticking out of the ground, you're probably observing a volcanic neck. Also known as a lava neck or volcanic plug, a volcanic neck is formed when magma solidifies within a vent of an active volcano. This can harness great amounts of pressures which could lead to an explosive eruption.</span>
